Vintage steel frame NAUTICAL DISTANCE INSTRUMENT made in GERMANY mid twentieth century used to measure Nautical Miles, Statute Miles, Kilometers, one inch to one mile on maps, having English on one side. The other side in French Inches to Miles or Versies, Centimeters to Kilometers, rotating disc at base corresponds to movable needle, measuring distance on maps. Measuremants: 3"x 1 1/8" Condition is excellent.